22199756681 has 2 divisors, whose sum is σ = 22199756682. Its totient is φ = 22199756680.

The previous prime is 22199756647. The next prime is 22199756707. The reversal of 22199756681 is 18665799122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20622396025 + 1577360656 = 143605^2 + 39716^2 .

It is a cyclic number.

It is not a de Polignac number, because 22199756681 - 2¹⁰ = 22199755657 is a prime.

It is a super-2 number, since 2×22199756681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22199756981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11099878340 + 11099878341.

It is an arithmetic number, because the mean of its divisors is an integer number (11099878341).

Almost surely, 2^22199756681 is an apocalyptic number.

It is an amenable number.

22199756681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22199756681 is an equidigital number, since it uses as much as digits as its factorization.

22199756681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 56.

The spelling of 22199756681 in words is "twenty-two billion, one hundred ninety-nine million, seven hundred fifty-six thousand, six hundred eighty-one".